Instead of writing many if..else statements, you can use the switch statement.
The switch statement selects one of many code blocks to be executed:
Syntax :
switch(expression) {
case x:
// code block
break;
case y:
// code block
break;
default:
// code block
}
#include<stdio.h>
int main() {
int day = 4;
switch(day) {
case 1:
printf("Monday");
break;
case 2:
printf("Tuesday");
break;
case 3:
printf("Wednesday");
break;
case 4:
printf("Thursday");
break;
case 5:
printf("Friday");
break;
case 6:
printf("Saturday");
break;
case 7:
printf("Sunday");
break;
}
return 0;
}
When C reaches a break keyword, it breaks out of the switch block.
This will stop the execution of more code and case testing inside the block.
When a match is found, and the job is done, it's time for a break. There is no need for more testing.
A break can save a lot of execution time because it "ignores" the execution of all the rest of the code in the switch block.
The default keyword specifies some code to run if there is no case match:
#include<stdio.h>
int main() {
int day = 4;
switch (day) {
case 6:
printf("Today is Saturday");
break;
case 7:
printf("Today is Sunday");
break;
default:
printf("Looking forward to the Weekend");
}
return 0;
}
Note: The default keyword must be used as the last statement in the switch, and it does not need a break.